JP2003231959A - Hot-dip galvannealed steel plate manufacturing facility - Google Patents
Hot-dip galvannealed steel plate manufacturing facilityInfo
- Publication number
- JP2003231959A JP2003231959A JP2002035348A JP2002035348A JP2003231959A JP 2003231959 A JP2003231959 A JP 2003231959A JP 2002035348 A JP2002035348 A JP 2002035348A JP 2002035348 A JP2002035348 A JP 2002035348A JP 2003231959 A JP2003231959 A JP 2003231959A
- Authority
- JP
- Japan
- Prior art keywords
- acidic solution
- hot
- steel sheet
- facility
- dip galvanized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、合金化溶融亜鉛
めっき鋼板の製造設備に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for producing alloyed hot-dip galvanized steel sheets.
【０００２】[0002]
【従来の技術】合金化溶融亜鉛めっき鋼板は亜鉛めっき
鋼板と比較して溶接性および塗装性に優れることから、
自動車車体用途を中心に広範な分野で広く利用されてい
る。そのような用途での合金化溶融亜鉛めっき鋼板は、
プレス成形を施されて使用に供される。しかし、合金化
溶融亜鉛めっき鋼板は、冷延鋼板に比べてプレス成形性
が劣るという欠点を有する。これはプレス金型での合金
化溶融めっき鋼板の摺動抵抗が冷延鋼板に比べて大きい
ことが原因である。すなわち、金型とビードでの摺動抵
抗が大きい部分で合金化溶融亜鉛めっき鋼板がプレス金
型に流入しにくくなり、鋼板の破断が起こりやすい。2. Description of the Related Art Alloyed hot-dip galvanized steel sheets are superior in weldability and paintability to galvanized steel sheets.
It is widely used in a wide range of fields, mainly for automobile body applications. Alloyed hot-dip galvanized steel sheets for such applications are
It is press-molded and used. However, the alloyed hot-dip galvanized steel sheet has a drawback that it is inferior in press formability to the cold-rolled steel sheet. This is because the sliding resistance of the alloyed hot-dip steel sheet in the press die is higher than that of the cold-rolled steel sheet. That is, it becomes difficult for the galvannealed steel sheet to flow into the press die at a portion where the sliding resistance between the die and the bead is large, and the steel sheet is likely to break.
【０００３】合金化溶融亜鉛めっき鋼板は、鋼板に亜鉛
めっきを施した後、加熱処理を行い、鋼板中のFeとめっ
き層中のZnが拡散する合金化反応が生じることにより、
Fe-Zn合金相を形成させたものである。このFe-Zn合金相
は、通常、Γ相、δ1相、ζ相からなる皮膜であり、Fe
濃度が低くなるに従い、すなわち、Γ相→δ1相→ζ相
の順で、硬度ならびに融点が低下する傾向がある。この
ため、摺動性の観点からは、高硬度で、融点が高く凝着
の起こりにくい高Fe濃度の皮膜が有効であり、プレス成
形性を重視する合金化溶融亜鉛めっき鋼板は、皮膜中の
平均Fe濃度を高めに製造されている。The galvannealed steel sheet is subjected to a heat treatment after galvanizing the steel sheet to cause an alloying reaction in which Fe in the steel sheet and Zn in the plating layer diffuse.
The Fe-Zn alloy phase is formed. This Fe-Zn alloy phase is usually a film consisting of Γ phase, δ 1 phase, and ζ phase.
The hardness and the melting point tend to decrease as the concentration decreases, that is, in the order of Γ phase → δ 1 phase → ζ phase. Therefore, from the viewpoint of slidability, a coating with high hardness, a high melting point, and a high Fe concentration that is unlikely to cause adhesion is effective. Manufactured with a high average Fe concentration.
【０００４】しかしながら、高Fe濃度の皮膜では、めっ
き−鋼板界面に硬くて脆いΓ相が形成されやすく加工時
に、界面から剥離 する現象、いわゆるパウダリングが
生じ易い問題を有している。このため、特開平1-319661
号公報に示されているように、摺動性と耐パウダリング
性を両立するために、上層に第二層として硬質のFe系合
金を電気めっきなどの手法により付与する方法がとられ
ている。However, a film having a high Fe concentration has a problem that a hard and brittle Γ phase is likely to be formed at the plating-steel plate interface, and a phenomenon of peeling from the interface during processing, so-called powdering, easily occurs. For this reason, JP-A-1-319661
As shown in the publication, in order to achieve both slidability and powdering resistance, a method of applying a hard Fe-based alloy as a second layer to the upper layer by a method such as electroplating has been adopted. .
【０００５】亜鉛系めっき鋼板使用時のプレス成形性を
向上させる方法としては、この他に、高粘度の潤滑油を
塗布する方法が広く用いられている。しかし、この方法
では、潤滑油の高粘性のために塗装工程で脱脂不良によ
る塗装欠陥が発生したり、また、プレス時の油切れによ
り、プレス性能が不安定になる等の問題がある。従っ
て、合金化溶融亜鉛めっき自身のプレス成形性が改善さ
れることが強く要請されている。As a method of improving the press formability when using a zinc-based plated steel sheet, a method of applying a high-viscosity lubricating oil is also widely used. However, in this method, there are problems that a coating defect occurs due to poor degreasing in the coating process due to the high viscosity of the lubricating oil, and the press performance becomes unstable due to oil shortage during pressing. Therefore, it is strongly demanded that the press formability of the galvannealing itself be improved.
【０００６】上記の問題を解決する方法として、特開昭
53-60332号公報および特開平2-190483号公報には、亜鉛
系めっき鋼板の表面に電解処理、浸漬処理、塗布酸化処
理、または加熱処理を施すことにより、ZnOを主体とす
る酸化膜を形成させて溶接性、または加工性を向上させ
る技術を開示している。As a method for solving the above problems, Japanese Patent Laid-Open No.
In 53-60332 and JP-A 2-190483, the surface of a zinc-based plated steel sheet is subjected to electrolytic treatment, dipping treatment, coating oxidation treatment, or heat treatment to form an oxide film mainly composed of ZnO. A technique for improving weldability or workability is disclosed.
【０００７】特開平4-88196号公報は、亜鉛系めっき鋼
板の表面に、リン酸ナトリウム5〜60g/lを含みpH2〜6の
水溶液にめっき鋼板を浸漬するか、電解処理を行うか、
または、上記水溶液を塗布することにより、P酸化物を
主体とした酸化膜を形成して、プレス成形性及び化成処
理性を向上させる技術を開示している。Japanese Unexamined Patent Publication No. 4-88196 discloses that the surface of a zinc-based plated steel sheet is immersed in an aqueous solution containing 5 to 60 g / l of sodium phosphate and having a pH of 2 to 6, or is subjected to electrolytic treatment.
Alternatively, a technique is disclosed in which an oxide film mainly containing P oxide is formed by applying the above-mentioned aqueous solution to improve press moldability and chemical conversion treatability.
【０００８】特開平3-191093号公報は、亜鉛系めっき鋼
板の表面に電解処理、浸漬処理、塗布処理、塗布酸化処
理、または加熱処理により、Ni酸化物を生成させること
により、プレス成形性および化成処理性を向上させる技
術を開示している。Japanese Unexamined Patent Publication (Kokai) No. 3-191093 discloses press-formability by forming Ni oxide on the surface of a zinc-based plated steel sheet by electrolytic treatment, dipping treatment, coating treatment, coating oxidation treatment, or heat treatment. A technique for improving chemical conversion treatability is disclosed.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、上記の
先行技術を合金化溶融亜鉛めっき鋼板に適用した場合、
プレス成形性の改善効果を安定して得ることはできな
い。本発明者らは、その原因について詳細な検討を行っ
た結果、合金化溶融めっき鋼板はAl酸化物が存在するこ
とにより表面の反応性が劣ること、及び表面の凹凸が大
きいことが原因であることを見出した。即ち、先行技術
を合金化溶融めっき鋼板に適用した場合、表面の反応性
が低いため、電解処理、浸漬処理、塗布酸化処理及び加
熱処理等を行っても、所定の皮膜を表面に形成すること
は困難であり、反応性の低い部分、すなわち、Al酸化物
量が多い部分では膜厚が薄くなってしまう。また、表面
の凹凸が大きいため、プレス成型時にプレス金型と直接
接触するのは表面の凸部となるが、凸部のうち膜厚の薄
い部分と金型との接触部での摺動抵抗が大きくなり、プ
レス成形性の改善効果が十分には得られない。However, when the above-mentioned prior art is applied to an alloyed hot-dip galvanized steel sheet,
The improvement effect of press formability cannot be stably obtained. As a result of a detailed study on the cause thereof, the inventors have found that the alloyed hot-dip plated steel sheet has poor surface reactivity due to the presence of Al oxides, and has large surface irregularities. I found that. That is, when the prior art is applied to the alloyed hot-dip plated steel sheet, since the surface reactivity is low, a predetermined film can be formed on the surface even if electrolytic treatment, dipping treatment, coating oxidation treatment and heat treatment are performed. Is difficult, and the film thickness becomes thin in a portion having low reactivity, that is, a portion having a large amount of Al oxide. In addition, since the surface irregularities are large, it is the convex portions of the surface that come into direct contact with the press die during press molding, but the sliding resistance at the contact portion between the thin portion of the convex portion and the die Becomes large, and the effect of improving press formability cannot be sufficiently obtained.
【００１０】また、このような合金化溶融亜鉛めっき鋼
板を、自動車メーカーなどで使用する際には、使用量が
膨大になることから、大量にしかも品質の高い製品を安
定的に供給することが必要である。しかしながら、上記
のような合金化溶融亜鉛めっき鋼板は、通常の溶融めっ
きラインで製造することはできないため、現在のところ
大量に安定して供給できない課題がある。Further, when such an alloyed hot-dip galvanized steel sheet is used by an automobile manufacturer or the like, the amount of use becomes enormous. Therefore, it is possible to stably supply a large amount of high quality products. is necessary. However, the above-described galvannealed steel sheet cannot be manufactured in a usual hot-dip galvanizing line, so that there is a problem that a large amount cannot be stably supplied at present.
【００１１】本発明は、前記事情を考慮し、プレス成形
時の摺動特性に優れた合金化溶融亜鉛めっき鋼板を、工
業的規模で安定して製造する設備を提供することを目的
とする。In view of the above circumstances, it is an object of the present invention to provide equipment for stably producing an alloyed hot-dip galvanized steel sheet having excellent sliding properties during press forming on an industrial scale.
【００１２】[0012]
【課題を解決するための手段】本発明者らは、上記の課
題を解決すべく、鋭意研究を重ねた結果、合金化溶融め
っき鋼板表面に存在する平坦部表層の酸化物層厚さを10
nm以上に制御することで、安定して優れたプレス成形性
が得られることを知見した。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that the oxide layer thickness of the flat surface layer existing on the surface of the alloyed hot-dip plated steel sheet is 10
It has been found that by controlling the thickness to be not less than nm, stable and excellent press formability can be obtained.
【００１３】合金化溶融亜鉛めっき鋼板表面の上記平坦
部は、周囲と比較すると凸部として存在する。プレス成
形時に実際にプレス金型と接触するのは、この平坦部が
主体となるため、この平坦部における摺動抵抗を小さく
すれば、プレス成形性を安定して改善することができ
る。この平坦部における摺動抵抗を小さくするには、め
っき層と金型との凝着を防ぐのが有効であり、そのため
には、めっき層の表面に、硬質かつ高融点の皮膜を形成
することが有効である。この観点から検討を進めた結
果、平坦部表層の酸化物層厚さを制御することが有効で
あり、こうして平坦部表層の酸化膜厚を制御すると、め
っき層と金型の凝着が生じず、良好な摺動性を示すこと
を見出した。また、このような酸化膜厚の形成には、酸
性溶液と接触させてめっき表層に酸化物層を形成する方
法が有効なことが明らかになった。The flat portion on the surface of the galvannealed steel sheet exists as a convex portion as compared with the surroundings. Since the flat portion mainly contacts the press die during press molding, the press formability can be stably improved by reducing the sliding resistance in the flat portion. In order to reduce the sliding resistance in this flat part, it is effective to prevent the plating layer from sticking to the mold. To that end, form a hard and high melting point film on the surface of the plating layer. Is effective. As a result of further studies from this point of view, it is effective to control the oxide layer thickness of the flat portion surface layer, and if the oxide film thickness of the flat portion surface layer is controlled in this way, adhesion between the plating layer and the mold does not occur. It has been found that it exhibits good slidability. Further, it has been revealed that a method of forming an oxide layer on the plating surface layer by contacting with an acidic solution is effective for forming such an oxide film thickness.
【００１４】本発明者らは、前記の知見に基づいて、合
金化溶融亜鉛めっき鋼板およびその製造方法について特
許出願した（特願2000-212591）。この出願に係る発明
は、鉄−亜鉛合金めっき表面に面積率で20〜80％の平坦
部を有し、その平坦部の表層に厚さが10nm以上の酸化物
層を有することを特徴とする合金化溶融亜鉛めっき鋼板
であり、前記鋼板を製造するに際し、鋼板に溶融亜鉛め
っきを施し、さらに加熱処理により合金化し、調質圧延
を施した後に、酸性溶液と接触させてめっき表層に酸化
物層を形成することを特徴とする合金化溶融亜鉛めっき
鋼板の製造方法である。The present inventors applied for a patent for a galvannealed steel sheet and a method for producing the same, based on the above findings (Japanese Patent Application No. 2000-212591). The invention according to this application is characterized in that the iron-zinc alloy plated surface has a flat portion with an area ratio of 20 to 80%, and the flat portion has a surface layer having an oxide layer having a thickness of 10 nm or more. It is an alloyed hot dip galvanized steel sheet, and when producing the steel sheet, hot dip galvanizing the steel sheet, alloying by further heat treatment, and after temper rolling, contact with an acid solution to form an oxide on the plating surface layer. A method for producing an alloyed hot-dip galvanized steel sheet, which comprises forming a layer.
【００１５】さらに、本発明者らは、プレス成形時の摺
動性に優れた合金化溶融めっき鋼板の製造方法について
検討した結果、前記製造方法において、酸性溶液に接触
終了後1〜30秒放置した後水洗、乾燥することによっ
て、摺動特性に優れた鋼板をより安定的に製造できるこ
とが明らかになり、この観点から特許出願した（特願20
01-059914）。Further, the inventors of the present invention have studied a method for producing an alloyed hot-dip plated steel sheet having excellent slidability during press forming, and as a result, in the above-mentioned production method, left for 1 to 30 seconds after completion of contact with an acidic solution. After that, it became clear that a steel plate having excellent sliding characteristics can be manufactured more stably by washing with water and drying, and a patent application was filed from this viewpoint (Patent Application 20
01-059914).
【００１６】本発明は、このようなプレス成形時の摺動
特性に優れた合金化溶融亜鉛めっき鋼板を、工業的規模
で安定して製造する設備を提供することを目的としたも
のであり、その要旨は次のとおりである。An object of the present invention is to provide a facility for stably producing an alloyed hot-dip galvanized steel sheet having excellent sliding characteristics during press forming on an industrial scale, The summary is as follows.
【００１７】第一発明は、溶融亜鉛めっき装置と、合金
化加熱炉と、冷却装置と、調質圧延機と、酸性溶液接触
装置と、酸性溶液濃縮領域と、水洗装置と、乾燥装置を
連設したことを特徴とする合金化溶融亜鉛めっき鋼板の
製造設備を提供する。The first invention comprises a hot dip galvanizing device, an alloying heating furnace, a cooling device, a temper rolling mill, an acidic solution contacting device, an acidic solution concentrating region, a water washing device, and a drying device. Provided is a facility for manufacturing an alloyed hot-dip galvanized steel sheet.
【００１８】第二発明は、溶融亜鉛めっき装置と、合金
化加熱炉と、冷却装置と、調質圧延機と、酸性溶液接触
装置と、酸性溶液濃縮領域と、中和処理装置と、乾燥装
置を連設したことを特徴とする合金化溶融亜鉛めっき鋼
板の製造設備を提供する。The second invention is a hot dip galvanizing device, an alloying heating furnace, a cooling device, a temper rolling mill, an acidic solution contacting device, an acidic solution concentrating region, a neutralization processing device, and a drying device. The present invention provides a facility for manufacturing alloyed hot-dip galvanized steel sheets, which is characterized in that
【００１９】第三発明は、第二発明において、酸性溶液
濃縮領域と中和処理装置の間に水洗装置を設置すること
を特徴とする合金化溶融亜鉛めっき鋼板の製造設備を提
供する。A third aspect of the present invention provides a facility for producing an alloyed hot-dip galvanized steel sheet according to the second aspect, wherein a water washing device is installed between the acidic solution concentration region and the neutralization treatment device.
【００２０】第四発明は、第二または第三発明におい
て、中和処理装置と乾燥装置の間に水洗装置を設置する
ことを特徴とする合金化溶融亜鉛めっき鋼板の製造設備
を提供する。A fourth aspect of the present invention provides a facility for producing an alloyed hot-dip galvanized steel sheet according to the second or third aspect, wherein a water washing device is installed between the neutralization treatment device and the drying device.
【００２１】第五発明は、第一〜第四発明のいずれかに
おいて、調質圧延機と酸性溶液接触装置の間に活性化処
理装置を設置することを特徴とする合金化溶融亜鉛めっ
き鋼板の製造設備を提供する。A fifth invention is an alloyed hot-dip galvanized steel sheet according to any one of the first to fourth inventions, characterized in that an activation treatment device is installed between the temper rolling mill and the acid solution contact device. Providing manufacturing equipment.
【００２２】第六発明は、第一〜第五発明のいずれかに
おいて、溶融亜鉛めっき装置の前に、連続焼鈍炉が配設
されていることを特徴とする合金化溶融亜鉛めっき鋼板
の製造設備を提供する。A sixth invention is the manufacturing facility for alloyed hot-dip galvanized steel sheet according to any one of the first to fifth inventions, characterized in that a continuous annealing furnace is arranged in front of the hot-dip galvanizing apparatus. I will provide a.
【００２３】[0023]
【発明の実施の形態】通常、合金化溶融亜鉛めっき鋼板
を製造するに際しては、溶融亜鉛めっき設備の前に設け
られている連続焼鈍炉で焼鈍され、溶融亜鉛めっき装置
でめっきされる。BEST MODE FOR CARRYING OUT THE INVENTION Normally, when manufacturing a galvannealed steel sheet, it is annealed in a continuous annealing furnace provided in front of a hot dip galvanizing facility and plated by a hot dip galvanizing apparatus.
【００２４】溶融亜鉛めっき装置としては、例えば、亜
鉛めっき浴温度近傍まで加熱された鋼帯（鋼板）を連続
的に亜鉛めっき浴へ導き、めっき浴から引き出された後
に、ガスワイピングによりめっき付着量を20〜120g/m2
に制御される。こうして溶融亜鉛めっきを施された鋼板
は、合金化加熱炉に導かれ、熱拡散によりめっき層中へ
Feが6〜15%程度含有せしめた合金化溶融亜鉛めっき鋼板
となる。この際、所定温度に加熱でき、めっき層中へ所
定量のFeを拡散させることができれば、その加熱方式に
制限はないが、高周波誘導加熱方式の加熱炉を用いると
有利である。これは、高周波誘導加熱方式を用いること
により、鋼板自体を瞬時に加熱できるため、短時間で均
一な合金化が可能であり、また、鋼板幅方向、長さ方向
でバラツキが少ないためである。As the hot dip galvanizing apparatus, for example, a steel strip (steel plate) heated to near the temperature of the galvanizing bath is continuously introduced into the galvanizing bath, and after being drawn out from the galvanizing bath, the amount of coating adhered by gas wiping. 20-120g / m 2
Controlled by. The steel sheet thus hot-dip galvanized is introduced into an alloying heating furnace and is thermally diffused into the plating layer.
The alloyed hot-dip galvanized steel sheet contains about 6 to 15% Fe. At this time, the heating system is not limited as long as it can be heated to a predetermined temperature and a predetermined amount of Fe can be diffused into the plating layer, but it is advantageous to use a heating furnace of a high frequency induction heating system. This is because the steel sheet itself can be instantly heated by using the high frequency induction heating method, so that uniform alloying can be performed in a short time, and there is little variation in the steel sheet width direction and the length direction.
【００２５】上記のように、溶融亜鉛めっき、さらに合
金化処理を施された鋼板は、高温であるため、例えば送
風機などを用いた冷却装置により、常温程度まで冷却す
る必要がある。Since the hot-dip galvanized and alloyed steel sheet is at a high temperature as described above, it needs to be cooled to about room temperature by a cooling device such as a blower.
【００２６】その後、材質の制御、めっき表面の粗度を
調整するため、冷却されためっき鋼板は調質圧延機に導
かれる。この調質圧延時には、めっきの凹凸が緩和さ
れ、めっき表面には平坦部が形成される。この凹凸の緩
和により合金化溶融亜鉛めっき鋼板の摺動性は向上する
ため、めっき表面に平坦部を存在させることは重要であ
る。一方、平坦化されない部分（凹部）は、潤滑油を保
持し、プレス成形時の油切れを防止する役割があること
から、凹部の存在も重要である。この観点から、めっき
表面の平坦部の面積率は20〜80%の範囲にあることが有
効であり、調質圧延時の圧下率は、前記平坦部の面積率
となるように調整する必要がある。Thereafter, in order to control the material and adjust the roughness of the plated surface, the cooled plated steel sheet is introduced into a temper rolling mill. During this temper rolling, the unevenness of the plating is alleviated and a flat portion is formed on the plating surface. Since the slidability of the galvannealed steel sheet is improved by alleviating this unevenness, it is important to have a flat portion on the plating surface. On the other hand, the non-planarized portion (concave portion) holds the lubricating oil and prevents the oil from running out during press molding, so that the presence of the concave portion is also important. From this point of view, it is effective that the area ratio of the flat part of the plating surface is in the range of 20 to 80%, and the rolling reduction during temper rolling needs to be adjusted to be the area ratio of the flat part. is there.
【００２７】引き続き、調質圧延後のめっき鋼板は、酸
性溶液接触装置、および酸性溶液濃縮領域に導かれ、め
っき表面平坦部にZnを主成分とする酸化物層を形成する
処理が施される。これは、めっき鋼板に酸性溶液を接触
させると、めっき成分であるZnが溶解し、これに伴う水
素発生反応により液のpHが上昇するため、Znの水酸化物
がめっき表面へ沈殿し、その結果、Znを主成分とする酸
化物層が形成されるためであると考えられる。しかしな
がら、単に酸性溶液と接触させただけでは、Znの溶解が
生じるのみで、酸化物層が形成されないため、液を乾燥
・濃縮する必要がある。本発明では、酸性溶液濃縮領域
で液を乾燥・濃縮する。Subsequently, the plated steel sheet after temper rolling is guided to an acidic solution contacting device and an acidic solution concentration area, and is subjected to a treatment for forming an oxide layer containing Zn as a main component on the flat portion of the plated surface. . This is because when a plated steel sheet is brought into contact with an acidic solution, Zn, which is a plating component, is dissolved, and the pH of the solution increases due to the hydrogen generation reaction accompanying this, so that the hydroxide of Zn precipitates on the plating surface. As a result, it is considered that an oxide layer containing Zn as a main component is formed. However, merely contacting with an acidic solution causes dissolution of Zn and does not form an oxide layer, so the solution needs to be dried and concentrated. In the present invention, the liquid is dried and concentrated in the acidic solution concentration region.
【００２８】酸性溶液接触装置では、めっき鋼板と酸性
溶液の接触が行われればよく、酸性溶液への浸漬処理を
行う装置、酸性溶液のスプレー装置、酸性溶液をロール
などを用いて塗布する装置等があげられる。また、使用
する酸性溶液は、めっき層中のZnを溶解する必要がある
ため、pHは1.0〜4.0程度に制御する必要がある。pHがこ
の範囲にあれば、その他に制限はなく、塩酸、硫酸、硝
酸などを用いることができ、また塩化物、硫酸塩、硝酸
塩などの化合物類を添加した溶液を用いてもよい。In the acidic solution contacting device, it is sufficient that the plated steel sheet and the acidic solution are contacted with each other. An apparatus for dipping in an acidic solution, a spraying device for the acidic solution, a device for applying the acidic solution using a roll, etc. Can be given. Further, the acidic solution used needs to dissolve Zn in the plating layer, and therefore the pH needs to be controlled to about 1.0 to 4.0. There is no other limitation as long as the pH is within this range, and hydrochloric acid, sulfuric acid, nitric acid or the like can be used, and a solution to which compounds such as chloride, sulfate or nitrate are added may be used.
【００２９】一方、酸性溶液濃縮領域では、酸性溶液を
完全に乾燥させる必要はないが、酸性溶液が濃縮し、酸
化物が生成するのに十分な時間を経過させる必要があ
る。すなわち、酸性溶液が表面に少量存在する場合に
は、酸性溶液濃縮領域で鋼板を大気にさらしておく（放
置しておく）だけでも十分である。この場合、大気にさ
らす時間（放置時間）は1〜30秒であることが望まし
い。酸性溶液が表面に多量に存在する場合には、大気に
さらしておくだけでは、酸化物が生成するのに長時間を
要し、十分なスペースが必要であるため、加熱炉を設け
たり、熱風乾燥装置を設けたりすることにより、鋼板表
面の酸性溶液の濃縮を促進させる装置を設けるとより効
果的である。また、このような鋼板表面の酸性溶液の濃
縮を促進させる装置の設置が不可能な場合には、酸性溶
液接触後に、絞りロールなどを用いて酸性溶液の付着量
を制御し、酸化物生成時間を短縮することも可能であ
る。この場合、酸性溶液の付着量は3.0g/m2以下に制御
することが好ましい。On the other hand, in the acidic solution concentration region, it is not necessary to completely dry the acidic solution, but it is necessary to allow sufficient time for the acidic solution to be concentrated and oxides to be generated. That is, when a small amount of the acidic solution is present on the surface, it is sufficient to expose the steel sheet to the atmosphere (leave it) in the concentrated area of the acidic solution. In this case, it is desirable that the time of exposure to air (standing time) is 1 to 30 seconds. If a large amount of acidic solution is present on the surface, it will take a long time for oxides to form and sufficient space will be required if it is exposed to the atmosphere. It is more effective to provide a device for promoting the concentration of the acidic solution on the surface of the steel plate by providing a drying device. Further, when it is impossible to install such a device for promoting the concentration of the acidic solution on the surface of the steel sheet, after the contact with the acidic solution, the adhesion amount of the acidic solution is controlled by using a squeeze roll or the like, and the oxide generation time Can be shortened. In this case, it is preferable to control the amount of the acidic solution attached to 3.0 g / m 2 or less.
【００３０】こうして酸性溶液濃縮領域を通過した鋼板
は、表面に残存した酸性溶液成分を洗い流す処理が施さ
れる。この観点から、直後に水洗装置を設け、鋼板の水
洗処理を行うとよいが、この水洗が不十分であると、酸
性溶液成分がめっき表面に残存し、実際の製品となった
場合に腐食を促進する恐れがある。このため、鋼板を水
洗するかわりに、中和処理装置に導くことにより、めっ
き表面に残存した酸性溶液成分を中和する処理を施すと
より効果的である。中和処理に使用する溶液は、アルカ
リ性の溶液であれば特に制限はなく、水酸化ナトリウ
ム、リン酸ナトリウムなどの水溶液を使用することがで
きる。The steel sheet that has passed through the acidic solution concentration region in this manner is subjected to a treatment for washing away the acidic solution components remaining on the surface. From this point of view, it is better to install a water washing device immediately after that to wash the steel sheet with water, but if this water washing is insufficient, the acidic solution component remains on the plating surface, and corrosion occurs when it becomes an actual product. May be promoted. Therefore, instead of washing the steel sheet with water, it is more effective to conduct a treatment for neutralizing the acidic solution component remaining on the plating surface by introducing it into a neutralization treatment device. The solution used for the neutralization treatment is not particularly limited as long as it is an alkaline solution, and an aqueous solution of sodium hydroxide, sodium phosphate or the like can be used.
【００３１】この中和処理装置は、めっき液乾燥領域の
直後に設けることもできるが、めっき液が乾燥したまま
鋼板を中和処理装置に導入すると、中和処理液が汚染さ
れる場合があるため、めっき液乾燥領域と中和処理装置
の間に水洗装置を設置し、一旦水洗を行うとよい。ま
た、中和処理装置を通過した鋼板も、そのまま乾燥して
も問題ないが、中和処理液が鋼板表面に残存すると、表
面ムラなどにより外観を損ねる恐れがあるため、中和処
理装置と乾燥装置の間に水洗装置を設置し、一旦水洗し
た後、乾燥することが望ましい。This neutralizing apparatus can be provided immediately after the plating solution drying area, but if the steel sheet is introduced into the neutralizing apparatus while the plating solution is dry, the neutralizing solution may be contaminated. Therefore, it is advisable to install a water washing device between the plating solution drying area and the neutralization processing device to once perform water washing. Also, the steel sheet that has passed through the neutralization treatment device can be dried without any problem, but if the neutralization treatment liquid remains on the surface of the steel sheet, the appearance may be damaged due to surface unevenness, etc. It is desirable to install a washing device between the devices, wash once with water, and then dry.
【００３２】このように、めっき表面への酸化物形成処
理が施された後のめっき鋼板は、最終的に、鋼板表面の
水分を完全に除去するため、乾燥装置に導かれ、製品と
なる。In this way, the plated steel sheet after the oxide forming treatment on the plated surface is finally introduced into a drying device to completely remove the moisture on the surface of the steel sheet, and becomes a product.
【００３３】このようにして形成されるめっき表面平坦
部の酸化物層の厚さは、プレス成形性の向上のため10nm
以上であることが必要であるが、厳しいプレス成形が施
される場合には、20nm以上であることが好ましい。また
酸化物層厚さの上限は特にないが、200nmを超えると表
面の反応性が極端に低下し、化成処理皮膜を形成するの
が困難になるため、200nm以下とするのが望ましい。The thickness of the oxide layer on the flat surface of the plating thus formed is 10 nm in order to improve press formability.
It is necessary that it is not less than 20 nm, but it is preferably not less than 20 nm when severe press molding is performed. The upper limit of the thickness of the oxide layer is not particularly limited, but if it exceeds 200 nm, the reactivity of the surface is extremely lowered and it becomes difficult to form a chemical conversion treatment film. Therefore, the thickness is preferably 200 nm or less.
【００３４】上記のように、酸性溶液接触装置に導く前
に、活性化処理装置を通過させるとより効果的である。
これは、合金化加熱処理により、めっき鋼板表面には酸
化物層が形成されており、その後の調質圧延過程で大部
分が破壊されているものの、残存している酸化物も多
く、反応性が低いためである。この観点から、酸性溶液
に浸漬する前に、めっき表面に残存した酸化物を極力除
去することは重要である。As described above, it is more effective to pass through the activation treatment device before leading to the acidic solution contacting device.
This is because an oxide layer is formed on the surface of the plated steel sheet by the alloying heat treatment, and most of the oxide is destroyed in the subsequent temper rolling process, but there are many remaining oxides and the reactivity is high. Is low. From this point of view, it is important to remove the oxide remaining on the plating surface as much as possible before the immersion in the acidic solution.
【００３５】このような活性化処理の方法には特に制限
はないが、表面を研削するなどの機械的に除去する方法
や、強アルカリ性溶液と接触させることにより化学的に
溶解させ除去する方法などが挙げられる。The method of such activation treatment is not particularly limited, but a method of mechanically removing it by grinding the surface, a method of chemically dissolving it by bringing it into contact with a strong alkaline solution, and the like, etc. Is mentioned.
【００３６】[0036]
【実施例】次に、本発明の実施例を挙げる。なお、以下
の図において、説明済みの図に示された部分には同じ符
号を付してその説明を省略する。
（実施例1）図1は、本発明の装置の第１の実施の形態を
示す概略説明図である。図1において、1は連続焼鈍炉、
2は溶融亜鉛めっき槽、3は合金化加熱炉、4は冷却装
置、5は調質圧延機、7は酸洗溶液接触装置である酸性溶
液トレイ、8は酸性溶液濃縮領域、10は水洗装置、12は
乾燥装置である。EXAMPLES Next, examples of the present invention will be described. In the following figures, the parts shown in the figures already explained are given the same reference numerals and the explanation thereof will be omitted. (Example 1) FIG. 1 is a schematic explanatory view showing a first embodiment of an apparatus of the present invention. In FIG. 1, 1 is a continuous annealing furnace,
2 is a hot dip galvanizing tank, 3 is an alloying heating furnace, 4 is a cooling device, 5 is a temper rolling mill, 7 is an acidic solution tray which is a pickling solution contact device, 8 is an acidic solution concentration area, and 10 is a water washing device. , 12 are drying devices.
【００３７】図1の装置では、次のようにして合金化溶
融亜鉛めっき鋼板を製造する。連続焼鈍炉1で鋼帯Sの表
面を清浄化するとともに焼鈍を施した後、溶融亜鉛めっ
き槽2へ導き、溶融亜鉛めっきを施し、溶融亜鉛めっき
鋼帯Sとする。次いで、溶融亜鉛めっき鋼帯Sを合金化加
熱炉3へ導き、加熱してめっき層内へ鉄を熱拡散して合
金化処理を施した後、冷却装置4へ導き、めっき鋼帯Sを
常温まで冷却し、次いで調質圧延機5へ導き、調質圧延
を施す。その後、50℃、pH2.0の硫酸酸性溶液を満たし
た酸性溶液トレイ7に導かれ、酸性溶液に浸漬しためっ
き鋼帯Sは、酸性溶液濃縮領域8で鋼板を大気に接触さ
せ、水洗装置10で水洗した後、乾燥装置12で水分を除去
することにより、めっき表面に酸化物層を形成しためっ
き鋼帯（合金化溶融亜鉛めっき鋼帯）Sが得られる。最
終的には、簡易防錆油を塗布しコイル状に巻き取り製品
とする。In the apparatus shown in FIG. 1, a galvannealed steel sheet is manufactured as follows. After the surface of the steel strip S is cleaned and annealed in the continuous annealing furnace 1, the steel strip S is introduced into a hot dip galvanizing tank 2 and subjected to hot dip galvanizing to obtain a hot dip galvanized steel strip S. Then, the hot-dip galvanized steel strip S is introduced into the alloying heating furnace 3, which is heated to thermally diffuse the iron into the plating layer for alloying treatment, and then introduced into the cooling device 4, where the galvanized steel strip S is kept at room temperature. It is cooled to a temper rolling mill 5 and then subjected to temper rolling. Thereafter, the plated steel strip S guided to an acidic solution tray 7 filled with a sulfuric acid acidic solution having a pH of 50 ° C. and pH 2.0 and immersed in the acidic solution is brought into contact with the steel plate in the acidic solution concentrating region 8 with the atmosphere, and the washing device 10 is used. After being washed with water, the water is removed by the drying device 12 to obtain a plated steel strip (alloyed galvanized steel strip) S having an oxide layer formed on the plated surface. Finally, a simple rust preventive oil is applied and coiled into a product.
【００３８】（実施例2）図2は、本発明の装置の第2の
実施の形態を示す概略説明図である。図2の装置では、
酸性溶液濃縮領域8に誘導加熱装置9が設置されている。
図2の装置では、次のようにして合金化溶融亜鉛めっき
鋼板を製造する。(Embodiment 2) FIG. 2 is a schematic explanatory view showing a second embodiment of the apparatus of the present invention. In the device of Figure 2,
An induction heating device 9 is installed in the acidic solution concentration region 8.
The apparatus of FIG. 2 manufactures a galvannealed steel sheet as follows.
【００３９】連続焼鈍炉1で鋼帯Sの表面を清浄化すると
ともに焼鈍を施した後、溶融亜鉛めっき槽2へ導き、溶
融亜鉛めっきを施し、溶融亜鉛めっき鋼帯Sとする。次
いで、溶融亜鉛めっき鋼帯Sを合金化加熱炉3へ導き、加
熱してめっき層内へ鉄を熱拡散して合金化処理を施した
後、冷却装置4へ導き、めっき鋼帯Sを常温まで冷却し、
次いで調質圧延機5へ導き、調質圧延を施す。その後、5
0℃、pH2.0の硫酸酸性溶液を満たした酸性溶液トレイ7
に導かれ、酸性溶液に浸漬しためっき鋼帯Sは、誘導加
熱装置9を設置した酸性溶液濃縮領域8で鋼板表面の酸性
溶液を濃縮する処理を行い、水洗装置10で水洗した後、
乾燥装置12で水分を除去することにより、めっき表面に
酸化物層を形成しためっき鋼帯Sが得られる。最終的に
は、簡易防錆油を塗布しコイル状に巻き取り製品とす
る。After the surface of the steel strip S is cleaned and annealed in the continuous annealing furnace 1, the steel strip S is introduced into the hot dip galvanizing tank 2 and subjected to hot dip galvanizing to obtain the hot dip galvanized steel strip S. Then, the hot-dip galvanized steel strip S is introduced into the alloying heating furnace 3, which is heated to thermally diffuse the iron into the plating layer for alloying treatment, and then introduced into the cooling device 4, where the galvanized steel strip S is kept at room temperature. Cool down to
Then, it is guided to the temper rolling mill 5 and subjected to temper rolling. Then 5
Acidic solution tray 7 filled with sulfuric acid acidic solution of pH 2.0 at 0 ℃ 7
The steel strip S immersed in the acidic solution is subjected to a treatment for concentrating the acidic solution on the surface of the steel sheet in the acidic solution concentrating region 8 in which the induction heating device 9 is installed, and after washing with the water washing device 10,
By removing the water with the drying device 12, a plated steel strip S having an oxide layer formed on the plated surface can be obtained. Finally, a simple rust preventive oil is applied and coiled into a product.
【００４０】（実施例3）図3は、本発明の装置の第3の
実施の形態を示す概略説明図である。図3の装置におい
て、11は中和処理装置であるアルカリスプレー処理装置
であり、酸性溶液濃縮領域8と、アルカリスプレー処理
装置（中和処理装置）11と、乾燥装置12が連接されてい
る。図3の装置では、次のようにして合金化溶融亜鉛め
っき鋼板を製造する。(Embodiment 3) FIG. 3 is a schematic explanatory view showing a third embodiment of the apparatus of the present invention. In the apparatus of FIG. 3, 11 is an alkali spray processing apparatus which is a neutralization processing apparatus, and an acidic solution concentration region 8, an alkali spray processing apparatus (neutralization processing apparatus) 11 and a drying apparatus 12 are connected to each other. The apparatus of FIG. 3 manufactures a galvannealed steel sheet as follows.
【００４１】図3において、連続焼鈍炉1で鋼帯Sの表面
を清浄化するとともに焼鈍を施した後、溶融亜鉛めっき
槽2へ導き、溶融亜鉛めっきを施し、溶融亜鉛めっき鋼
帯Sとする。次いで、溶融亜鉛めっき鋼帯Sを合金化加熱
炉3へ導き、加熱してめっき層内へ鉄を熱拡散して合金
化処理を施した後、冷却装置4へ導き、めっき鋼帯Sを常
温まで冷却し、次いで調質圧延機5へ導き、調質圧延を
施す。その後、50℃、pH2.0の硫酸酸性溶液を満たした
酸性溶液トレイ7に導かれ、酸性溶液に浸漬しためっき
鋼帯Sは、酸性溶液濃縮領域8で鋼板を大気に接触させた
後、アルカリスプレー処理装置11で50℃、pH10.0の水酸
化ナトリウム溶液と接触させることにより、めっき表面
に残存した酸性溶液を中和除去し、次いで乾燥装置12で
水分を除去することにより、めっき表面に酸化物層を形
成しためっき鋼帯Sが得られる。最終的には、簡易防錆
油を塗布しコイル状に巻き取り製品とする。In FIG. 3, after the surface of the steel strip S is cleaned and annealed in the continuous annealing furnace 1, it is introduced into the hot dip galvanizing tank 2 and hot dip galvanized to obtain hot dip galvanized steel strip S. . Then, the hot-dip galvanized steel strip S is introduced into the alloying heating furnace 3, which is heated to thermally diffuse the iron into the plating layer for alloying treatment, and then introduced into the cooling device 4, where the galvanized steel strip S is kept at room temperature. It is cooled to a temper rolling mill 5 and then subjected to temper rolling. After that, the plated steel strip S guided to the acidic solution tray 7 filled with sulfuric acid acidic solution of 50 ° C. and pH 2.0, and immersed in the acidic solution, after contacting the steel plate with the atmosphere in the acidic solution concentration region 8 to the alkali, By contacting with a sodium hydroxide solution having a pH of 10.0 at 50 ° C. in the spray processing device 11, the acidic solution remaining on the plating surface is neutralized and removed, and then the water is removed by the drying device 12 to form a plating surface. A plated steel strip S having an oxide layer is obtained. Finally, a simple rust preventive oil is applied and coiled into a product.
【００４２】（実施例4）図4は、本発明の装置の第4の
実施の形態を示す概略説明図である。図4の装置では、
酸性溶液濃縮領域8と、アルカリスプレー処理装置（中
和処理装置）11の間に水洗装置10が設けられている。図
4の装置では、次のようにして合金化溶融亜鉛めっき鋼
板を製造する。(Embodiment 4) FIG. 4 is a schematic explanatory view showing a fourth embodiment of the apparatus of the present invention. In the device of Figure 4,
A water washing device 10 is provided between the acidic solution concentration region 8 and the alkali spray treatment device (neutralization treatment device) 11. Figure
In the apparatus of No. 4, the galvannealed steel sheet is manufactured as follows.
【００４３】図4において、連続焼鈍炉1で鋼帯Sの表面
を清浄化するとともに焼鈍を施した後、溶融亜鉛めっき
槽2へ導き、溶融亜鉛めっきを施し、溶融亜鉛めっき鋼
帯Sとする。次いで、溶融亜鉛めっき鋼帯Sを合金化加熱
炉3へ導き、加熱してめっき層内へ鉄を熱拡散して合金
化処理を施した後、冷却装置4へ導き、めっき鋼帯Sを常
温まで冷却し、次いで調質圧延機5へ導き、調質圧延を
施す。その後、50℃、pH2.0の硫酸酸性溶液を満たした
酸性溶液トレイ7に導かれ、酸性溶液に浸漬しためっき
鋼帯Sは、酸性溶液濃縮領域8で鋼板を大気に接触させ、
水洗装置10で水洗する。その後、アルカリスプレー処理
装置11で50℃、pH10.0の水酸化ナトリウム溶液と接触さ
せることにより、めっき表面に残存した酸性溶液を中和
除去し、次いで乾燥装置12で水分を除去することによ
り、めっき表面に酸化物層を形成しためっき鋼帯Sが得
られる。最終的には、簡易防錆油を塗布しコイル状に巻
き取り製品とする。In FIG. 4, after the surface of the steel strip S is cleaned and annealed in the continuous annealing furnace 1, it is introduced into the hot dip galvanizing tank 2 and hot dip galvanized to obtain hot dip galvanized steel strip S. . Then, the hot-dip galvanized steel strip S is introduced into the alloying heating furnace 3, which is heated to thermally diffuse the iron into the plating layer for alloying treatment, and then introduced into the cooling device 4, where the galvanized steel strip S is kept at room temperature. It is cooled to a temper rolling mill 5 and then subjected to temper rolling. Then, 50 ° C., guided to the acidic solution tray 7 filled with sulfuric acid acidic solution of pH 2.0, the plated steel strip S immersed in the acidic solution, the steel sheet is contacted with the atmosphere in the acidic solution concentration region 8,
Wash with water using the water washing device 10. Then, 50 ° C. in the alkaline spray treatment device 11, by contacting with a sodium hydroxide solution of pH 10.0, to neutralize and remove the acidic solution remaining on the plating surface, then by removing water with the drying device 12, A plated steel strip S having an oxide layer formed on the plated surface is obtained. Finally, a simple rust preventive oil is applied and coiled into a product.
【００４４】（実施例5）図5は、本発明の装置の第5の
実施の形態を示す概略説明図である。図5の装置では、
酸性溶液濃縮領域8とアルカリスプレー処理装置（中和
処理装置）11の間に第１の水洗装置10が設けられ、さら
にアルカリスプレー処理装置（中和処理装置）11と乾燥
装置12の間に第2の水洗装置10が設けられている。図5の
装置では、次のようにして合金化溶融亜鉛めっき鋼板を
製造する。(Fifth Embodiment) FIG. 5 is a schematic explanatory view showing a fifth embodiment of the apparatus of the present invention. In the device of Figure 5,
A first water washing device 10 is provided between the acidic solution concentration region 8 and the alkali spray treatment device (neutralization treatment device) 11, and a first water washing device 10 is further provided between the alkali spray treatment device (neutralization treatment device) 11 and the drying device 12. A washing device 10 of 2 is provided. The apparatus of FIG. 5 manufactures a galvannealed steel sheet as follows.
【００４５】図5において、連続焼鈍炉1で鋼帯Sの表面
を清浄化するとともに焼鈍を施した後、溶融亜鉛めっき
槽2へ導き、溶融亜鉛めっきを施し、溶融亜鉛めっき鋼
帯Sとする。次いで、溶融亜鉛めっき鋼帯Sを合金化加熱
炉3へ導き、加熱してめっき層内へ鉄を熱拡散して合金
化処理を施した後、冷却装置4へ導き、めっき鋼帯Sを常
温まで冷却し、次いで調質圧延機5へ導き、調質圧延を
施す。その後、50℃、pH2.0の硫酸酸性溶液を満たした
酸性溶液トレイ7に導かれ、酸性溶液に浸漬しためっき
鋼帯Sは、酸性溶液濃縮領域8で鋼板を大気に接触させ、
水洗装置10で水洗した。その後、アルカリスプレー処理
装置11で50℃、pH10.0の水酸化ナトリウム溶液と接触さ
せることにより、めっき表面に残存した酸性溶液を中和
除去した後、水洗装置10で水洗し、次いで乾燥装置12で
水分を除去することにより、めっき表面に酸化物層を形
成しためっき鋼帯Sが得られる。最終的には、簡易防錆
油を塗布しコイル状に巻き取り製品とする。In FIG. 5, after the surface of the steel strip S is cleaned and annealed in the continuous annealing furnace 1, the steel strip S is introduced into the hot dip galvanizing tank 2 and hot dip galvanized to obtain hot dip galvanized steel strip S. . Then, the hot-dip galvanized steel strip S is introduced into the alloying heating furnace 3, which is heated to thermally diffuse the iron into the plating layer for alloying treatment, and then introduced into the cooling device 4, where the galvanized steel strip S is kept at room temperature. It is cooled to a temper rolling mill 5 and then subjected to temper rolling. Then, 50 ° C., guided to the acidic solution tray 7 filled with sulfuric acid acidic solution of pH 2.0, the plated steel strip S immersed in the acidic solution, the steel sheet is contacted with the atmosphere in the acidic solution concentration region 8,
It was washed with the water washing device 10. Thereafter, the alkali spray treatment device 11 is brought into contact with a sodium hydroxide solution having a pH of 10.0 at 50 ° C. to neutralize and remove the acidic solution remaining on the plating surface, followed by washing with a washing device 10 and then a drying device 12 By removing the water with, the plated steel strip S having an oxide layer formed on the plated surface can be obtained. Finally, a simple rust preventive oil is applied and coiled into a product.
【００４６】（実施例6）図6は、本発明の装置の第6の
実施の形態を示す概略説明図であり、調質圧延機5と酸
性溶液接触装置7の間に、活性化処理装置である前処理
用アルカリスプレー装置6を設置した例である。図6の装
置では、図5の装置について、調質圧延機5と酸性溶液接
触装置7の間に、さらに前処理用アルカリスプレー装置
（活性化処理装置）6が付設されている。図6の装置で
は、次のようにして合金化溶融亜鉛めっき鋼板を製造す
る。(Embodiment 6) FIG. 6 is a schematic explanatory view showing a sixth embodiment of the apparatus of the present invention, in which an activation treatment device is provided between the temper rolling mill 5 and the acid solution contact device 7. This is an example in which the pretreatment alkali spray device 6 is installed. In the apparatus of FIG. 6, in the apparatus of FIG. 5, a pretreatment alkali spray device (activation treatment device) 6 is further provided between the temper rolling mill 5 and the acid solution contact device 7. The apparatus of FIG. 6 manufactures a galvannealed steel sheet as follows.
【００４７】図6において、連続焼鈍炉1で鋼帯Sの表面
を清浄化するとともに焼鈍を施した後、溶融亜鉛めっき
槽2へ導き、溶融亜鉛めっきを施し、溶融亜鉛めっき鋼
帯Sとする。次いで、溶融亜鉛めっき鋼帯Sを合金化加熱
炉3へ導き、加熱してめっき層内へ鉄を熱拡散して合金
化処理を施した後、冷却装置4へ導き、めっき鋼帯Sを常
温まで冷却し、次いで調質圧延機5へ導き、調質圧延を
施す。その後、前処理用アルカリスプレー装置6で、50
℃、pH12.0の水酸化ナトリウム水溶液と接触させ、50
℃、pH2.0の硫酸酸性溶液を満たした酸性溶液トレイ7に
導かれ、酸性溶液に浸漬しためっき鋼帯Sは、酸性溶液
濃縮領域8で鋼板を大気に接触させ、水洗装置10で水洗
する。その後、アルカリスプレー処理装置11で50℃、pH
10.0の水酸化ナトリウム溶液と接触させることにより、
めっき表面に残存した酸性溶液を中和除去した後、水洗
装置10で水洗し、次いで乾燥装置12で水分を除去するこ
とにより、めっき表面に酸化物層を形成しためっき鋼帯
Sが得られる。最終的には、簡易防錆油を塗布しコイル
状に巻き取り製品とする。In FIG. 6, after the surface of the steel strip S is cleaned and annealed in the continuous annealing furnace 1, the steel strip S is introduced into the hot dip galvanizing tank 2 and hot dip galvanized to obtain hot dip galvanized steel strip S. . Then, the hot-dip galvanized steel strip S is introduced into the alloying heating furnace 3, which is heated to thermally diffuse the iron into the plating layer for alloying treatment, and then introduced into the cooling device 4, where the galvanized steel strip S is kept at room temperature. It is cooled to a temper rolling mill 5 and then subjected to temper rolling. After that, with the pretreatment alkaline spray device 6, 50
℃, contact with sodium hydroxide aqueous solution of pH 12.0, 50
The plated steel strip S guided to the acidic solution tray 7 filled with sulfuric acid acidic solution of pH 2.0 and pH 2.0 and immersed in the acidic solution makes the steel sheet contact with the atmosphere in the acidic solution concentration region 8 and rinsed with the rinsing device 10. . Then, at the alkali spray treatment equipment 11, 50 ℃, pH
By contacting with 10.0% sodium hydroxide solution,
After neutralizing and removing the acidic solution remaining on the plating surface, the product is washed with a water washing device 10 and then water is removed with a drying device 12 to form an oxide layer on the plating surface of the plated steel strip.
S is obtained. Finally, a simple rust preventive oil is applied and coiled into a product.
【００４８】[0048]
【発明の効果】本発明によれば、めっき表面平坦部に酸
化物層を形成することにより摺動性を向上させ、プレス
成形性に優れた合金化溶融亜鉛めっき鋼板を量産するこ
とができるので、工業的に大きな効果を奏することがで
きる。EFFECTS OF THE INVENTION According to the present invention, by forming an oxide layer on the flat portion of the plated surface, it is possible to improve the slidability and mass produce an alloyed hot-dip galvanized steel sheet excellent in press formability. Therefore, it is possible to exert a great effect industrially.
【図1】本発明の装置の第１の実施の形態を示す概略説
明図。FIG. 1 is a schematic explanatory view showing a first embodiment of an apparatus of the present invention.
【図2】本発明の装置の第2の実施の形態を示す概略説明
図。FIG. 2 is a schematic explanatory view showing a second embodiment of the device of the present invention.
【図3】本発明の装置の第3の実施の形態を示す概略説明
図。FIG. 3 is a schematic explanatory view showing a third embodiment of the device of the present invention.
【図4】本発明の装置の第4の実施の形態を示す概略説明
図。FIG. 4 is a schematic explanatory view showing a fourth embodiment of the device of the present invention.
【図5】本発明の装置の第5の実施の形態を示す概略説明
図。FIG. 5 is a schematic explanatory view showing a fifth embodiment of the device of the present invention.
【図6】本発明の装置の第6の実施の形態を示す概略説明
図。FIG. 6 is a schematic explanatory view showing a sixth embodiment of the device of the present invention.
1 連続焼鈍炉
2 溶融亜鉛めっき槽
3 合金化加熱炉
4 冷却装置
5 調質圧延機
6 前処理用アルカリスプレー処理装置（活性化処理装
置）
7 酸性溶液トレイ（酸性溶液接触装置）
8 酸性溶液濃縮領域
9 誘導加熱装置
10 水洗装置
11 アルカリスプレー処理装置（中和処理装置）
12 乾燥装置1 Continuous annealing furnace 2 Hot dip galvanizing tank 3 Alloying heating furnace 4 Cooling device 5 Temper rolling mill 6 Alkaline spray processing device for pretreatment (activation processing device) 7 Acid solution tray (acid solution contact device) 8 Acid solution concentration Area 9 Induction heating device 10 Water washing device 11 Alkali spray treatment device (neutralization treatment device) 12 Drying device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 稲垣 淳一 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 山下 正明 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 蒲 昭 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 宮川 洋一 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 Ｆターム(参考） 4K027 AA05 AA22 AB02 AB28 AB42 AC73 AC82 AC87 AD25 AD26 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Junichi Inagaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Masaaki Yamashita 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Akira Kamata 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Yoichi Miyagawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. F-term (reference) 4K027 AA05 AA22 AB02 AB28 AB42 AC73 AC82 AC87 AD25 AD26
Claims (6)
と、冷却装置と、調質圧延機と、酸性溶液接触装置と、
酸性溶液濃縮領域と、水洗装置と、乾燥装置を連設した
ことを特徴とする合金化溶融亜鉛めっき鋼板の製造設
備。1. A hot dip galvanizing device, an alloying heating furnace, a cooling device, a temper rolling mill, an acidic solution contact device,
A facility for manufacturing an alloyed hot-dip galvanized steel sheet, which comprises an acidic solution concentrating region, a water washing device, and a drying device, which are connected in series.
と、冷却装置と、調質圧延機と、酸性溶液接触装置と、
酸性溶液濃縮領域と、中和処理装置と、乾燥装置を連設
したことを特徴とする合金化溶融亜鉛めっき鋼板の製造
設備。2. A hot dip galvanizing device, an alloying heating furnace, a cooling device, a temper rolling mill, an acidic solution contact device,
A facility for manufacturing an alloyed hot-dip galvanized steel sheet, which comprises an acidic solution concentrating region, a neutralization treatment device, and a drying device connected in series.
水洗装置を設置することを特徴とする請求項2に記載の
合金化溶融亜鉛めっき鋼板の製造設備。3. The facility for manufacturing an alloyed hot-dip galvanized steel sheet according to claim 2, wherein a water washing device is installed between the acidic solution concentration region and the neutralization treatment device.
を設置することを特徴とする請求項2または請求項3に記
載の合金化溶融亜鉛めっき鋼板の製造設備。4. The facility for producing an alloyed hot-dip galvanized steel sheet according to claim 2 or 3, wherein a water washing device is installed between the neutralization treatment device and the drying device.
性化処理装置を設置することを特徴とする請求項1〜4の
いずれかに記載の合金化溶融亜鉛めっき鋼板の製造設
備。5. The facility for producing a galvannealed steel sheet according to any one of claims 1 to 4, wherein an activation treatment device is installed between the temper rolling mill and the acidic solution contact device.
が配設されていることを特徴とする請求項1〜5のいずれ
かに記載の合金化溶融亜鉛めっき鋼板の製造設備。6. The facility for producing an alloyed hot-dip galvanized steel sheet according to any one of claims 1 to 5, wherein a continuous annealing furnace is arranged in front of the hot-dip galvanizing apparatus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002035348A JP2003231959A (en) | 2002-02-13 | 2002-02-13 | Hot-dip galvannealed steel plate manufacturing facility |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002035348A JP2003231959A (en) | 2002-02-13 | 2002-02-13 | Hot-dip galvannealed steel plate manufacturing facility |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005360082A Division JP2006183147A (en) | 2005-12-14 | 2005-12-14 | Equipment for manufacturing hot-dip galvannealed steel sheet |
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| Publication Number | Publication Date |
|---|---|
| JP2003231959A true JP2003231959A (en) | 2003-08-19 |
Family
ID=27777556
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007016267A (en) * | 2005-07-06 | 2007-01-25 | Jfe Steel Kk | Method for manufacturing galvannealed steel sheet, and galvannealed steel sheet |
| JP2013224459A (en) * | 2012-04-20 | 2013-10-31 | Jfe Steel Corp | Method for producing high lubrication hot dip galvanized steel sheet having excellent appearance property |
-
2002
- 2002-02-13 JP JP2002035348A patent/JP2003231959A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007016267A (en) * | 2005-07-06 | 2007-01-25 | Jfe Steel Kk | Method for manufacturing galvannealed steel sheet, and galvannealed steel sheet |
| JP4650128B2 (en) * | 2005-07-06 | 2011-03-16 | Ｊｆｅスチール株式会社 | Method for producing alloyed hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet |
| JP2013224459A (en) * | 2012-04-20 | 2013-10-31 | Jfe Steel Corp | Method for producing high lubrication hot dip galvanized steel sheet having excellent appearance property |
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